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. 2023 Dec 12;13:22044. doi: 10.1038/s41598-023-49128-8

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© The Author(s) 2023

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(a) SEM image of the capillary with an internal diameter of 3 µm and external diameter of 9 µm (3–9 capillary). (b), capillary with an inner dimension of 3 µm and an external dimension of 25 µm (3–25 capillary).